Simon Willison’s Weblog

How Regexes Work (via) They’re just simplified syntax for constructing a state machine

Posted 25th November 2003 at 12:27 am

Recent articles

Saying "hi" to Microsoft's Phi-4-reasoning - 6th May 2025
Feed a video to a vision LLM as a sequence of JPEG frames on the CLI (also LLM 0.25) - 5th May 2025
Two publishers and three authors fail to understand what "vibe coding" means - 1st May 2025